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Dianions of 7,7,8,8-tetracyano--quinodimethane and perfluorinated tetracyanoquinodimethane: Information on excited states from lifetime measurements in an electrostatic storage ring and optical absorption spectroscopy
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10.1063/1.2771177
/content/aip/journal/jcp/127/12/10.1063/1.2771177
http://aip.metastore.ingenta.com/content/aip/journal/jcp/127/12/10.1063/1.2771177

Figures

Image of FIG. 1.
FIG. 1.

Sodium-promoted generation of TCNQ and dianions: Monoanions of TCNQ and were produced by electrospray ionization and converted to dianions in collisions with Na.

Image of FIG. 2.
FIG. 2.

Schematic layout of the electrostatic storage ring ELISA.

Image of FIG. 3.
FIG. 3.

Time spectrum of neutral counts for stored ions in ELISA.

Image of FIG. 4.
FIG. 4.

(a) Electron emission from in the storage ring, detected as a signal from in a channeltron placed after the 10° electrostatic deflector. [(b) and (c)] Time dependence of the number of dianions stored in the ring, measured by dumping the beam onto a microchannel plate detector with a varying delay after the injection.

Image of FIG. 5.
FIG. 5.

Potential energy of dianion as a function of the distance between the monoanion and the electron. The potential energy is zero at infinite distance. The electronic ground state is a bound state, whereas the two excited states are unbound. Electron transfer from sodium occurs to either the electronic ground state or to an electronically excited state. The two electronically excited states can also be reached by photon absorption of the dianion in its electronic ground state.

Image of FIG. 6.
FIG. 6.

(a) Electron emission from in the storage ring, detected as a signal from in a channeltron placed after the 10° electrostatic deflector. (b) Time dependence of the number of dianions stored in the ring, measured by dumping the beam onto a microchannel plate detector with a varying delay after the injection.

Image of FIG. 7.
FIG. 7.

Gas phase (a) and solution phase (b) absorption spectra of . The data between 400 and can be described by the sum of two Gaussians.

Image of FIG. 8.
FIG. 8.

(Color online) Spectroelectrochemistry of in MeCN containing as supporting electrolyte. Blue: Anion after electrolysis at vs ; Green: Dianion after electrolysis at vs ; Red: Neutral species obtained after final electrolysis at vs . Cell path length: .

Tables

Generic image for table
Table I.

Dianion lifetimes. The number in parenthesis is the fraction that the component comprises of the total decay.

Generic image for table
Table II.

Absorption maxima of and its reduced species in in comparison to those obtained previously for TCNQ.

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/content/aip/journal/jcp/127/12/10.1063/1.2771177
2007-09-24
2014-04-24
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Dianions of 7,7,8,8-tetracyano-p-quinodimethane and perfluorinated tetracyanoquinodimethane: Information on excited states from lifetime measurements in an electrostatic storage ring and optical absorption spectroscopy
http://aip.metastore.ingenta.com/content/aip/journal/jcp/127/12/10.1063/1.2771177
10.1063/1.2771177
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